body {
    width: 100%;
    max-width: 760px;
    min-width: 320px;
    margin: 0 auto;
    font-size: 14px;
    font-family: -apple-system, Helvetica, sans-serif;
    height: 2000px;
}

.app {
    height: 45px;
}

ul {
    margin: 0;
    padding: 0;
}
img{
    vertical-align: top;
}
.app ul li {
    float: left;
    height: 45px;
    background-color: #333333;
    list-style: none;
    text-align: center;
    line-height: 45px;
    color: #fff;
}

.app ul li:nth-child(1) {
    width: 8%;
}
.app ul li:nth-child(1) img {
    margin-top: 20px;
    width: 10px;
}

.app ul li:nth-child(2) {
    width: 10%;
}
.app ul li:nth-child(2) img{
    width: 30px;
    vertical-align:middle;
}

.app ul li:nth-child(3) {
    width: 57%;
}

.app ul li:nth-child(4) {
    width: 25%;
    background-color: #f63155;
}
.search-wrap{
    position: fixed;
    overflow: hidden;
    height: 44px;
    width: 100%;
    min-width: 320px;
    max-width: 640px;
}
.search-btn{
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
}
.search-btn::before{
    content: '';
    display: block;
    width: 20px;
    height: 18px;
    background: url("../images/s-btn.png")no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}
.search-login{
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    color: #ffffff;
    line-height: 44px;
    text-align: center;
}
.search{
    position: relative;
    margin: 7px 50px 0;
    height: 30px;
    border-radius: 15px;
    background-color: #fff;
}
.jd-icon{
    position: absolute;
    top: 8px;
    left: 13px;
    width: 20px;
    height: 15px;
    background: url("../images/jd.png") no-repeat;
    background-size: 20px 15px;
}
.jd-icon::after{
    position: absolute;
    content: '';
    display: block;
    top: 0;
    right: -10px;
    height: 15px;
    width: 1px;
    background-color: #ccc;
}
.sou{
    position: absolute;
    top: 8px;
    left: 50px;
    width: 18px;
    height: 15px;
    background: url("../images/jd-sprites.png") no-repeat -80px 0;
    background-size: 200px auto;
}
.search-wrap input{
    position: absolute;
    top: 5px;
    right: 10px;
    height: 15px;
    border-radius: 15px;
}
.slider img{
    width: 100%;
}
.brand{
    overflow: hidden;
    border-radius: 15px 15px 0 0;
}
.brand div{
    width: 33.333%;
    float: left;
}
.brand div img{
    width: 100%;
}
nav a{
    float: left;
    width: 20%;
    text-align: center;
    text-decoration: none;
}
nav img{
    width: 40px;
    height: 40px;
    margin-top: 10px;
}
.news a{
    float: left;
}
.news a:nth-child(1){
    width: 50%;
}
.news a:nth-child(2),.news a:nth-child(3){
    width: 25%;
    box-sizing: border-box;
    border-left: 1px solid #333333;
}
.news a img{
    width: 100%;
}





